#include<stdio.h>
int main()
{
    long i;
    int j;
    printf("Please input number:");
    scanf("%ld",&i);
    for(j=999;j>=100;j--)
    if(i%j==0)
    {
        printf("The max factor with 3 digits in %ld is: %d,\n",i,j);
        break;
    }
}